Kryptek's Our New Super Warm Down Vest provides the backcountry hunters with a packable insulation layer for added warmth during long periods of stationary activities. These New down vests use Kryptek Defender down insulation which specifically design to provide lightweight exceptional warmth even in damp conditions. They even packs into their own pocket for easy storage.Sizing ChartX-Small - Chest: 33-35 ; Sleeve: 31.5 ; Waist: 27-29 ; Hip: 32-34Small - Chest: 35-37 ; Sleeve: 32.5 ; Waist: 29-31 ; Hip: 34-36Medium - Chest: 37-39 ; Sleeve: 33.5 ; Waist: 32-34 ; Hip: 37-39Large - Chest: 40-44 ; Sleeve: 34.5 ; Waist: 34-36 ; Hip: 39-42XL - Chest: 44-47 ; Sleeve: 35.5 ; Waist: 37-39 ; Hip: 44-46XXL - Chest: 48-51 ; Sleeve: 36 ; Waist: 40-43 ; Hip: 47-49XXXL - Chest: 52-55 ; Sleeve: 36.5 ; Waist: 44-47 ; Hip: 50-52